Roles of leaf trichomes in heat transfers and gas‐exchange characteristics across environmental gradients

Amada, Gaku; Kosugi, Yukio; Kitayama, Kanehiro; Onoda, Yusuke

doi:10.22541/au.160794364.42389606/v1

Cited by 7 publications

(3 citation statements)

References 45 publications

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“…Meinzer and Goldstein (1985) simulated effects of hairs on energy balance in Espletia timotensis by assuming hairs entrained a layer of still air equal to their depth and that hairs did not affect absorptance; their simulations reasonably matched observations of greater leaf temperatures in hairy as compared to partially-shaved leaves. Amada et al (2021) observed lower in situ leaf temperatures in shaved versus hairy leaves of Metrosideros polymorpha ; having verified that surface conductances to water vapor did not differ between the two treatments, the authors attributed the result to reduction in g bh , and thus in convective cooling. That result could also have arisen from effects of leaf hairs on radiation absorption, although hairs in M. polymorpha are light in color and thus probably reduced radiation absorption rather than the converse.…”

Section: Discussionmentioning

confidence: 90%

Leaf trichomes reduce boundary layer conductance

Buckley

Pierce

Sack³

2022

Preprint

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Leaf trichomes (hairs) have multiple hypothesized functions, of which several require empirical evidence. An important, yet controversial, proposed function of trichomes is to influence the leaf boundary layer, which would affect leaf temperature, transpiration and photosynthesis, and may confer differential benefits depending on climate. We used dynamic infrared thermography to test whether trichomes reduce the boundary layer conductance to heat ( g), impeding heat transfer between leaves and air. For five species, with trichome lengths of 135-780 μm, we transiently heated leaves with a radiative light source, measured the time constant for subsequent leaf cooling simultaneously in two adjacent leaf regions (with and without trichomes) with an IR camera, and inferred g using an energy balance model. Cooling was slower in hairy leaf regions relative to bald regions, corresponding to a lower g in hairy regions, by 2.4% to 39% across species. Contrary to prior theory, the resistance added by trichomes was unrelated to the depth of the hair layer (i.e., trichome height) across species. Simulations predicted that the reduction in g by trichomes would influence energy balance and gas exchange rates by up to a few percent, with the direction and magnitude of such effects depending sensitively on environmental conditions.

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Section: Discussionmentioning

confidence: 90%

Leaf trichomes reduce boundary layer conductance

Buckley

Pierce

Sack³

2022

Preprint

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“…At high temperatures, the trichomes increase because they function to prevent excessive evaporation of the leaves. This condition is mainly Increasing leaf temperature affects trichomes, which can increase the activity of photosynthetic enzymes; leaf trichomes can increase the rate of photosynthesis (Amada et al, 2020). The flavonoid content is expressed in mg 100 g -1 dry matter.…”

Section: Resultsmentioning

confidence: 99%

Physiological Responses of Indigenous Vegetable of Sintrong (Crassocephalum crepidioides) due to Exposure to High Temperature

Utama

Kurniawati²,

Faridah³

2023

Caraka Tani J. Sustain. Agric.

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Sintrong is an Indonesian indigenous vegetable with leaves used for vegetables, digestive disorders, and burns. Changes in the environment due to an increase in temperature affect the growth and quality of sitrong, and its existence in the nature is threatened. This study aims to obtain information about the effect of exposure to high temperatures on the physiological character and flavonoid content of indigenous sintrong vegetables and obtain accession of sintrong, which can be developed as a functional vegetable. The Nested randomized group design was applied with two factors, temperature differences as the main plot and accession as a second plot. Four replications were conducted for each accession in the Cikabayan experimental garden of IPB. The results showed that exposure to high temperatures up to 32 °C increased the speed of flowering age, which was 4.76% and 7.14% faster and showed a high wilting rate of 36.66%, but decreased leaf area index up to 30.30% and 42.42% at the conditions above ambient temperature exposure (control). Flavonoid content did not show any effect due to exposure to high temperatures. The flavonoid content reached 1695.38 and 1834.83 mg QE 100 g<sup>-1</sup>. Bogor 1 accession showed the best performance so that the plants can be developed for functional vegetables. Based on the research findings, sintrong should be harvested earlier before flowering to obtain high leaf production and good-quality vegetables.

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“…However, other studies found drought stress did not induce trichome production (Piritta et al 2010). Furthermore, the formation and development of trichomes can be significantly influenced by temperature (Skelton et al 2012, Amada et al 2020). However, it remains unclear exactly which environmental factors primarily drive spatial variations in leaf trichome densities.…”

Section: Introductionmentioning

confidence: 99%

Spatial variations in leaf trichomes and their coordination with stomata in Quercus variabilis across Eastern Asia

Zhu

Zheng

Kang

et al. 2023

Preprint

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Understanding leaf trait variation is critical for the prediction of plant responses to global climate changes. Leaf trichomes are derived from stomatal epidermal cells, which play critical roles in biotic defenses and against abiotic stress. Previous studies reported spatial variations in stomatal traits and their driving factors at the same sampling sites. However, it remains unclear how leaf trichome densities vary along large geographic gradients and whether trichomes and stomata co-vary under environmental changes. We measured the leaf trichome densities of 44 Quercus variabilis populations in situ across Eastern Asia (24 to 51.8 °N, 99 to 137 °E) and 15 populations grown in a common garden, and used structural equation modelling to evaluate their relationships with climatic factors and stomatal traits. Our results revealed that climatic factors not only had a direct effect on trichome density, but also had indirect effects on trichome density through stomatal density and leaf mass per area. Trichome density was positively correlated with stomatal density whether in situ or in the common garden, and both increased with drought, which implied that trichomes may impact stomatal behavior and both traits may co-vary under certain environmental conditions. Our results suggested that leaf trichomes possess highly adaptive variation and are in close coordination with stomata in response to climate changes. Our findings provide new insights toward elucidating the interactions between leaf traits and the adaptive strategies of plants under climate change.

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Roles of leaf trichomes in heat transfers and gas‐exchange characteristics across environmental gradients

Cited by 7 publications

References 45 publications

Leaf trichomes reduce boundary layer conductance

Leaf trichomes reduce boundary layer conductance

Physiological Responses of Indigenous Vegetable of Sintrong (Crassocephalum crepidioides) due to Exposure to High Temperature

Spatial variations in leaf trichomes and their coordination with stomata in Quercus variabilis across Eastern Asia

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